feat: enable GitHub inline comment server for code-review plugin

Add support for automatically including the GitHub inline comment server when
the code-review@claude-code-plugins plugin is specified in the plugins input.
This enables the code-review plugin to post inline comments on PRs even in
agent mode.

Changes:
- Parse plugins input as string[] in parseGitHubContext
- Update inline comment server logic to check for code-review plugin
- Add comprehensive test coverage for inline comment server detection

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

test/modes/detector.test.ts

@@ -25,6 +25,7 @@ describe("detectMode with enhanced routing", () => {
       allowedBots: "",
       allowedNonWriteUsers: "",
       trackProgress: false,
+      plugins: [],
     },
   };